/*
 * This file is part of JFlowMap.
 *
 * Copyright 2009 Ilya Boyandin
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package fons.navigator.util.map;

import java.awt.geom.GeneralPath;
import java.awt.geom.Path2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.List;

import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.vividsolutions.jts.geom.Geometry;

import fons.navigator.util.Polygon;

/**
 * @author Ilya Boyandin
 *     Date: 25-Sep-2009
 */
public class MapArea {
	private final String id;
	private final String name;
	private final Polygon[] polygons;

	public MapArea(String id, String name, Iterable<Polygon> polygons) {
		this(id, name, Iterables.toArray(polygons, Polygon.class), false);
	}

	public MapArea(String id, String name, Polygon[] polygons) {
		this(id, name, polygons, true);
	}

	private MapArea(String id, String name, Polygon[] polygons, boolean clone) {
		this.id = id;
		this.name = name;
		if (clone) {
			this.polygons = polygons.clone();
		} else {
			this.polygons = polygons;
		}
	}

	public String getId() {
		return id;
	}

	public String getName() {
		return name;
	}

	public Polygon[] getPolygons() {
		return polygons.clone();
	}

	public boolean isEmpty() {
		for (Polygon p : polygons) {
			if (!p.isEmpty()) return false;
		}
		return true;
	}

	public Path2D asPath(MapProjection proj) {
		GeneralPath path = new GeneralPath();
		for (Polygon poly : polygons) {
			Point2D[] points = poly.getPoints();
			Point2D startP = proj.project(points[0].getX(), points[0].getY());
			path.moveTo(startP.getX(), startP.getY());
			for (int i = 1; i < points.length; i++) {
				Point2D p = proj.project(points[i].getX(), points[i].getY());
				path.lineTo(p.getX(), p.getY());
			}
		}
		return path;
	}

	public Rectangle2D asBoundingBox(MapProjection proj) {
		Rectangle2D.Double bb = null;
		for (Polygon poly : polygons) {
			for (Point2D point : poly.getPoints()) {
				Point2D p = proj.project(point.getX(), point.getY());
				if (bb == null) {
					bb = new Rectangle2D.Double(p.getX(), p.getY(), 0, 0);
				} else {
					if (!bb.contains(p)) {
						bb.add(p);
					}
				}
			}
		}
		return bb;
	}

	public static MapArea fromGeometry(String id, String name, Geometry g) {
		List<Polygon> list = Lists.newArrayList();

		if (g.getGeometryType().equals("Polygon")) {
			list.add(Polygon.convert((com.vividsolutions.jts.geom.Polygon)g));
		} else if (g.getGeometryType().equals("MultiPolygon")) {
			for (int i = 0; i < g.getNumGeometries(); i++) {
				list.add(Polygon.convert((com.vividsolutions.jts.geom.Polygon)g.getGeometryN(i)));
			}
		} else {
		}

		return new MapArea(id, name, list);
	}

}
